Bookmarklets
Bookmarklets are free tools to help with repetitive or otherwise impossible tasks in your web browser. To use a bookmarklet from this site on another web page: (full story)
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The Semantic Web
The Semantic Web is a mesh of information linked up in such a way as to be easily processable by machines, on a global scale. You can think of it as being an efficient way of representing data on the World Wide Web, or as a globally linked database. (full story)